The details of Devour from the Tahm Kench article on League of Legends wiki:
ACTIVE: Tahm Kench swallows an enemy non-champion or allied champion, making them untargetable and unable to take any actions for a short duration.
So I wonder, can a Tahm Kench eat another Tahm Kench that has something in its belly? For example, a Tahm Kench ate an ally Jinx and the enemy Tahm Kench comes. Ally Tahm Kench already has 2 stacks of An Acquired Taste. Is it possible for the enemy Tahm Kench to swallow the combination of Jinx and Tahm Kench?
What will happen if the answer is yes? Will Jinx be spit out while inside the enemy Tahm Kench first? Or will both Jinx and ally Tahm Kench be spit out at the same time?
Best Answer
In your scenario red Tahm swallows red Jinx and gets swallowed by blue Tahm. Blue Tahm will then spit out red Tahm before Jinx leaves.
If you turn it around blue Tahm swallows red Jinx. Blue Tahm then gets swallowed by Red Tahm. in this case Red Jinx will leave before blue Tahm.
In the first case red Jinx will be able to leave before the max time (6s) runs out.
In this video you can see a "Tahm Kench-ception" As you can see the ones that got eaten first will leave, regardless of how deep they are in.
Remember that Tahm Kench can keep allies in his mouth longer than enemies (6s for allies, 3s for enemies). So you'll spit out enemies faster than you would allies.
The only way this happens in a game is either in a one for all game mode or in a blind-pick game where 2 Tahm Kench are present.